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Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r--net/unix/af_unix.c51
1 files changed, 26 insertions, 25 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 971282b6f6a3..826e09938bff 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1340,7 +1340,6 @@ static void unix_destruct_scm(struct sk_buff *skb)
struct scm_cookie scm;
memset(&scm, 0, sizeof(scm));
scm.pid = UNIXCB(skb).pid;
- scm.cred = UNIXCB(skb).cred;
if (UNIXCB(skb).fp)
unix_detach_fds(&scm, skb);
@@ -1391,8 +1390,8 @@ static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool sen
int err = 0;
UNIXCB(skb).pid = get_pid(scm->pid);
- if (scm->cred)
- UNIXCB(skb).cred = get_cred(scm->cred);
+ UNIXCB(skb).uid = scm->creds.uid;
+ UNIXCB(skb).gid = scm->creds.gid;
UNIXCB(skb).fp = NULL;
if (scm->fp && send_fds)
err = unix_attach_fds(scm, skb);
@@ -1409,13 +1408,13 @@ static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool sen
static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock,
const struct sock *other)
{
- if (UNIXCB(skb).cred)
+ if (UNIXCB(skb).pid)
return;
if (test_bit(SOCK_PASSCRED, &sock->flags) ||
- (other->sk_socket &&
- test_bit(SOCK_PASSCRED, &other->sk_socket->flags))) {
+ !other->sk_socket ||
+ test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) {
UNIXCB(skb).pid = get_pid(task_tgid(current));
- UNIXCB(skb).cred = get_current_cred();
+ current_uid_gid(&UNIXCB(skb).uid, &UNIXCB(skb).gid);
}
}
@@ -1819,7 +1818,7 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
siocb->scm = &tmp_scm;
memset(&tmp_scm, 0, sizeof(tmp_scm));
}
- scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred);
+ scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid);
unix_set_secdata(siocb->scm, skb);
if (!(flags & MSG_PEEK)) {
@@ -1859,10 +1858,10 @@ out:
}
/*
- * Sleep until data has arrive. But check for races..
+ * Sleep until more data has arrived. But check for races..
*/
-
-static long unix_stream_data_wait(struct sock *sk, long timeo)
+static long unix_stream_data_wait(struct sock *sk, long timeo,
+ struct sk_buff *last)
{
DEFINE_WAIT(wait);
@@ -1871,7 +1870,7 @@ static long unix_stream_data_wait(struct sock *sk, long timeo)
for (;;) {
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
- if (!skb_queue_empty(&sk->sk_receive_queue) ||
+ if (skb_peek_tail(&sk->sk_receive_queue) != last ||
sk->sk_err ||
(sk->sk_shutdown & RCV_SHUTDOWN) ||
signal_pending(current) ||
@@ -1890,8 +1889,6 @@ static long unix_stream_data_wait(struct sock *sk, long timeo)
return timeo;
}
-
-
static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size,
int flags)
@@ -1936,14 +1933,12 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
goto out;
}
- skip = sk_peek_offset(sk, flags);
-
do {
int chunk;
- struct sk_buff *skb;
+ struct sk_buff *skb, *last;
unix_state_lock(sk);
- skb = skb_peek(&sk->sk_receive_queue);
+ last = skb = skb_peek(&sk->sk_receive_queue);
again:
if (skb == NULL) {
unix_sk(sk)->recursion_level = 0;
@@ -1966,7 +1961,7 @@ again:
break;
mutex_unlock(&u->readlock);
- timeo = unix_stream_data_wait(sk, timeo);
+ timeo = unix_stream_data_wait(sk, timeo, last);
if (signal_pending(current)
|| mutex_lock_interruptible(&u->readlock)) {
@@ -1980,10 +1975,13 @@ again:
break;
}
- if (skip >= skb->len) {
+ skip = sk_peek_offset(sk, flags);
+ while (skip >= skb->len) {
skip -= skb->len;
+ last = skb;
skb = skb_peek_next(skb, &sk->sk_receive_queue);
- goto again;
+ if (!skb)
+ goto again;
}
unix_state_unlock(sk);
@@ -1991,11 +1989,12 @@ again:
if (check_creds) {
/* Never glue messages from different writers */
if ((UNIXCB(skb).pid != siocb->scm->pid) ||
- (UNIXCB(skb).cred != siocb->scm->cred))
+ !uid_eq(UNIXCB(skb).uid, siocb->scm->creds.uid) ||
+ !gid_eq(UNIXCB(skb).gid, siocb->scm->creds.gid))
break;
- } else {
+ } else if (test_bit(SOCK_PASSCRED, &sock->flags)) {
/* Copy credentials */
- scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred);
+ scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid);
check_creds = 1;
}
@@ -2196,7 +2195,9 @@ static unsigned int unix_dgram_poll(struct file *file, struct socket *sock,
/* exceptional events? */
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
- mask |= POLLERR;
+ mask |= POLLERR |
+ (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
+
if (sk->sk_shutdown & RCV_SHUTDOWN)
mask |= POLLRDHUP | POLLIN | POLLRDNORM;
if (sk->sk_shutdown == SHUTDOWN_MASK)